diff --git a/extensions/matrix/src/env-vars.ts b/extensions/matrix/src/env-vars.ts
index a78e5bd4f0f..ac16c416ffc 100644
--- a/extensions/matrix/src/env-vars.ts
+++ b/extensions/matrix/src/env-vars.ts
@@ -1,5 +1,4 @@
 import { normalizeAccountId, normalizeOptionalAccountId } from "openclaw/plugin-sdk/account-id";
-import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 
 const MATRIX_SCOPED_ENV_SUFFIXES = [
   "HOMESERVER",
@@ -61,7 +60,7 @@ function decodeMatrixEnvAccountToken(token: string): string | undefined {
     if (!char || !/[A-Z0-9]/.test(char)) {
       return undefined;
     }
-    decoded += normalizeLowercaseStringOrEmpty(char);
+    decoded += char.toLowerCase();
     index += 1;
   }
   const normalized = normalizeOptionalAccountId(decoded);